Vista - Capturing exceptions

I wish to capture the message below "No such host is known"

Exception calling "GetHostAddresses" with "1" argument(s): "No such host is
known"
At D:\dnscheck.ps1:3 char:41


If computer name is xxxx, or not found, it will generate the error above.
How can i capture only the *meaningful* message ?
I don't want to use $erroractionpreference = "SilentlyContinue"

===================================
my sample script

$comp = "xxxx"

$ip = [system.net.dns]::gethostaddresses($comp) | foreach
{$_.ipaddresstostring}
$resolved = [system.net.dns]::gethostentry($ip) | foreach {$_.hostname}

write-host "Original name in AD" $comp
Write-host "Ping hostname" $ip
Write-host "Ping -a $ip, resolved hostname is" $resolved
===================================

Hi,
"trap" statement can catch the exception:

trap [System.Net.Sockets.SocketException] { continue; }

It says: capture [System.Net.Sockets.SocketException] only and continue
silently.

You can put this statement in your script.

Best wishes,
Tao ma

"IT Staff" <jkklim@xxxxxx> дÈëÏûÏ¢ÐÂÎÅ:eepyaZYOJHA.588@xxxxxx

How do i capture the exception message ?


"Tao Ma" <feng_eden@xxxxxx> wrote in message
news:OkML3gYOJHA.3876@xxxxxx

You can access $error virable or record it by yourself:

PS C:\> $err_arr = New-Object System.Collections.ArrayList
PS C:\> &{trap [System.Net.Sockets.SocketException] { [void]
$err_arr.Add($_); continue; }; [system.net.dns]::gethostaddresses('f')}
PS C:\> $err_arr[0]
No such host is known.
At line:1 char:112
+ &{trap [System.Net.Sockets.SocketException] { $err_arr.Add($_);
continue; }; [system.net.dns]::gethostaddresses <<<<
('f')}

Best wishes,
Tao Ma


"IT Staff" <jkklim@xxxxxx> дÈëÏûÏ¢ÐÂÎÅ:%23%23IzEBaOJHA.4504@xxxxxx

Hello IT,

TRy:

trap {write-warning $_.Exception.Message ;continue}
[system.net.dns]::gethostaddresses('foo')




---
Shay Levy
Windows PowerShell MVP
http://blogs.microsoft.co.il/blogs/ScriptFanatic
PowerShell Toolbar: http://tinyurl.com/PSToolbar


IS> I wish to capture the message below "No such host is known"
IS>
IS> Exception calling "GetHostAddresses" with "1" argument(s): "No such
IS> host is
IS> known"
IS> At D:\dnscheck.ps1:3 char:41
IS> If computer name is xxxx, or not found, it will generate the error
IS> above.
IS> How can i capture only the *meaningful* message ?
IS> I don't want to use $erroractionpreference = "SilentlyContinue"
IS> ===================================
IS> my sample script
IS> $comp = "xxxx"
IS>
IS> $ip = [system.net.dns]::gethostaddresses($comp) | foreach
IS> {$_.ipaddresstostring}
IS> $resolved = [system.net.dns]::gethostentry($ip) | foreach
IS> {$_.hostname}
IS> write-host "Original name in AD" $comp
IS> Write-host "Ping hostname" $ip
IS> Write-host "Ping -a $ip, resolved hostname is" $resolved
IS> ===================================

After going thru some trial and errors, i prefer to use this:

================
$error.clear()
$comp = "xxxx"
$erroractionpreference = "SilentlyContinue"


$ip = [system.net.dns]::gethostaddresses($comp) | foreach
{$_.ipaddresstostring}
if($error[0].Exception.Message -ne $null)
{$resolved=$error[0].Exception.Message;} else {$resolved =
[system.net.dns]::gethostentry($ip) | foreach {$_.hostname}}

write-host "Original name in AD" $comp
write-host "ip:" $ip
Write-host "DNS hostname :" $resolved
==================================

If there are better ways, please let me know.





"IT Staff" <jkklim@xxxxxx> wrote in message
news:eepyaZYOJHA.588@xxxxxx